Electrical feedback large-scale servo hydraulic cylinder driven by double motors

Abstract

The invention discloses an electrical feedback large-scale servo hydraulic cylinder driven by double motors. The electrical feedback large-scale servo hydraulic cylinder comprises a hydraulic cylinder, a pilot valve and a glide valve, wherein the pilot valve comprises a pilot valve body, a pilot valve core is arranged in the pilot valve body, a pilot valve first oil opening, a pilot valve second oil opening, a pilot valve third oil opening and a pilot valve fourth oil opening are sequentially formed in the pilot valve body from the left side to the right side, the pilot valve core can leftwards and rightwards move in the axial line direction of the pilot valve core via a slide moving mechanism through being driven by a driving motor and a feedback motor, the glide valve comprises a glide valve body, a glide valve core, a left valve cover, a right valve cover, a left spring and a right spring, the glide valve core is assembled in the glide valve body, the left valve cover is matched and connected with the left end of the glide valve body, the right end cover is matched and connected with the right end of the glide valve body, the left spring is arranged at the left end of the glide valve core, and the right spring is arranged at the right end of the glide valve core. When the electrical feedback large-scale servo hydraulic cylinder is adopted, the quantization control can be easily realized.

Description

technical field [0001] The invention relates to a servo hydraulic cylinder, and mainly relates to a large electric feedback servo hydraulic cylinder. Background technique [0002] Traditional hydraulic servo and proportional control systems are complicated to control and require D / A-A / D conversion, so direct control cannot be realized. In the prior art, the control precision of the proportional valve is low; the dead zone of the electro-hydraulic servo valve is small, the hysteresis is small, the frequency response is high, and the control precision is high, but the structure is complicated, the manufacturing cost is high, and the use is complicated. Most of the current digital quantitative hydraulic cylinders (patent 200920081786.9) use internal mechanical feedback mechanisms to control precision, but internal mechanical feedback mechanisms are difficult to manufacture, difficult to install, and complicated to maintain. Especially when the hydraulic cylinder stroke increas...

AI Technical Summary

Problems solved by technology

[0002] Traditional hydraulic servo and proportional control systems are complicated to control and require D / A-A / D conversion, which cannot realize direct control

Under the existing technology, the control precision of the proportional valve is low; the dead zone of the electro-hydraulic servo valve is small, the hysteresis is small, the frequency response is high, and the control precision is high, but the structure is complicated, the manufacturing cost is high, and the use is complicated

Most of the current digital quantitative hydraulic cylinders (patent 200920081786.9) use internal mechanical feedback mechanisms to control precision, but internal mechanical feedback mechanisms are difficult to manufacture, difficult to install, and complicated to maintain

Especially when the hydraulic cylinder stroke increases, the above problems will be more serious

Invention patent 201310092096.4 proposes "a kind of internal feedback digital servo hydraulic cylinder", although it solves some problems to a certain extent, but the pilot stage digital valve directly controls the hydraulic cylinder, so the flow rate should not be too large, so the speed of large hydraulic cylinders The control is slightly insufficient; and its feedback wire sleeve is supported by two bearings, resulting in an increase in the moment of inertia, which cannot guarantee its smooth response and accuracy

In addition, the hydraulic valve can only control the reciprocating movement of the hydraulic cylinder between two fixed points, which has poor stability for speed control, and cannot accurately control the hydraulic cylinder with large flow

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